Changes in the heritable attributes of populations of organisms over time. The mechanisms of evolution are mutation, migration, drift, and selection.

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Why people have less hair than other primates?

Well as you can figure out, most primates such as monkeys, gorillas and chimpanzees, have all their body covered with fur. As we know they are evolutional "relatives" to us humans, but we dont have ...
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42 views

Determination of genes to be modified in epigenetics [closed]

It seems that during reproduction particular genes are targeted for modification (mutation, deletion, insertion, etc.) given environmental inputs of either or both of the parents. If a creature was ...
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45 views

Why did we evolve to control our breath?

I had this question in my mind and tried to think of why we would evolve to be able to control our breath. I remembered the Aquatic Ape Hypothesis, which makes a lot of sense and would explain it, ...
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1answer
37 views

Can you naturally change your DNA that's passed to your offsprings? [on hold]

Is it possible to change the genes that you'll pass on to your offsprings by natural activity and behavior. For example if you do body building for quite a long time build strong muscles then would ...
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35 views

Why is sex pleasure giving activity but not childbirth?

Asking from an evolutionary viewpoint. Sex is a pleasure giving activity so that it encourages reproduction and spreading of genes. But childbirth ,the most crucial part of the reproductive process, ...
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4answers
2k views

Book recommendation on population/evolutionary genetics?

I have recently been involved in collaborations that require me to model the population genetics of eukaryotic populations. I fear I may either be "re-inventing the wheel" or making conceptual ...
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2answers
105 views

Why aren't there any transitional animals today?

You have probably heard this question before and in different formats. Usually, it is used as a "proof" to disprove the theory of evolution. I understand that the apes we descended from are not the ...
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1answer
34 views

Book recommendation: Modern Synthetic theory

I'm a zoology minor. I wish to study modern synthetic theory (evolution) is there a good book available online for reading? The book should cover a basic idea about what the elements of modern ...
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15 views

How the Phereoeca uterella (casebearer) is formed? [on hold]

Does anyone know how the Phereoeca uterella known as the casebearer is formed or born?
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6answers
9k views

Why haven't prey evolved the ability to always outrun their predators?

I can understand why some prey can't outrun a recently evolved species. However, since cheetahs have existed for so long, why haven't its prey evolved to always outrun it, driving cheetahs to ...
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1answer
81 views

Why is the manchineel tree so poisonous?

The machineel tree is incredibly toxic to humans. What advantage could Hippomane mancinella have for being so poisonous? It's name even apparently translates to “little apple that makes horses mad”. ...
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Would there be any other possibly exceptional phenomenons happen in the study of ' Concordance of monozygotic and dizygotic twins for traits'?

I am a first learner in this realm and I could not really understand any other academic papers on the websites , which is complicated for me .So I not sure how to use them effectively to support my ...
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1answer
37 views

What animals have a blood-brain barrier?

I am curious about how old the BBB is, in terms of evolution. Is it present in all vertebrates? or just mammals? or what?
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1answer
70 views

How to read cladograms/phylograms?

I understand the difference between cladograms and phylograms; the latter can show the evolutionary linkage over time. However, I am having trouble finding out which two organisms are most closely ...
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2answers
348 views

How do traits with no negative effects get “weeded out” via evolution?

If only those who are most fit to reproduce are the ones reproducing the most, it makes sense that traits that prevent one from reproducing would eventually disappear from a population. But what ...
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1answer
23 views

Are antibiotic-resistant bacteria necessarily less virulent than their original strain?

In the absence of antibiotic treatment, is there a reduction in the average severity of disease caused by resistant strains of pathogenic bacteria compared to wild-type ones? I would assume that ...
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0answers
59 views

Why do horses recycle their endometrial lining while humans don't?

How does not recycling the endometrial lining of the uterus benefit humans (and other organisms that menstruate), while recycling it is beneficial to horses (and other organisms that undergo estrus ...
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2answers
365 views

How did zootoxins evolve?

I've always wondered how toxins in certain organisms have evolved. Particularly, organisms that produce toxins as a deterrent to predators as opposed to organisms that use it to paralyze their prey. ...
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1answer
59 views

Evolution to store limited Fat

Why are our bodies not evolved to store only limited amounts of fat, which won't kill us with all diseases associated with obesity? Wouldn't obese people die faster and clean the gene pool for people ...
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1answer
52 views

What contributes to the variation of protein sequence across different species?

What contribute to the variation of protein sequence across different species (e.g. phenotype, environment, evolutionary pressure) and how do those factors contribute to the variation? I have tried ...
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3answers
66k views

What is the difference between orthologs, paralogs and homologs?

These three terms are often misused in the literature. Many researchers seem to treat them as synonyms. So, what is the definition of each of these terms and how do they differ from one another?
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27 views

What empirical evidence of genetic assimilation is there?

There have been many articles arguing that we should view the phenotype in the center of evolutionary theory rather than the genotype as done in most population (or quantitative) genetics. A typical ...
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0answers
611 views

Why don't rats have a gallbladder, unlike other rodents?

It has long been known that rats do not have a gallbladder, though other species including humans, monkeys, cows, reptiles, dogs and mice, all have a gallbladder. In this paper from almost 100 years ...
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3answers
5k views

What if rB=C in hamilton's rule?

Hamilton's rule states that if rB>C then a gene giving altruistic behaviour will increase in frequency in the population. What would happen if rB=C? Will an individual perform the altruistic act?
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0answers
78 views

Do animals have different taste preferences within the same species?

Humans (especially children...) seem to dislike certain foods or drinks, that other humans seem to like. Common examples are coffee, french cheeses, olives, milk, fish and cabbage. Are there examples ...
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1answer
34 views

What negative effects does cannabalism have in other species (like prion diseases) and how are they mitigated?

It is well known that human cannibals are likely to suffer from a variety of ailments, particularly prion diseases. However a great many other species, from insect to ape practice cannibalism at much ...
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1answer
44 views

Would someone lose some of their traits if they stop using them for some time? [closed]

A co-worker of mine told me, that there are some mutations in the genome during the life of a human body. So, the body changes genes to fit better into the surrounding environment. My thought is now, ...
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2answers
76 views

Why does the gc content deviate from 50% in prokaryotes

I have read quite some articles but I can't figure out the main reason for gc content deviation in prokaryotes. In eukaryotes I can understand it, because the genome isn't composed at random, like ...
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Are there any individual animals that can thrive in a wide range of core temperatures? [closed]

Surely, some cold blooded animals are in a position where they can't escape the changing temperatures the environment throws at them, so natural selection would have enabled them to thrive in a wide ...
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1answer
136 views

What were the camels' humps good for back in the polar areas?

I've heard that camels lived in the North America formerly and just in the last few thousands years they've migrated to the hot deserts. Thus they allegedly utilized the adaptations against the cold ...
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5answers
5k views

Why do some bad traits evolve, and good ones don't?

If a trait would be advantageous to an organism then why hasn't it evolved yet? Conversely, if a trait is not advantageous or mildly disadvantageous, why does it exist? In other words why does ...
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3answers
73 views

How valid is the theory of human's chimp-pig origin? [closed]

Edit: I have also asked the question on skeptics.stackexchange.com and it has been answered there. Here is the link. There is a person called Dr. Eugene McCarthy who has a theory that the origin of ...
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24 views

What is the effective population size of a simple two deme metapopulation?

I am confused as to how to compute the effective population size $N_e$ of a theoretical structured population. Let's consider here a simple case study. Imagine a 2-deme metapopulation. Each deme is ...
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2answers
8k views

What factors are known to affect evolution?

My understanding is that the possible mechanisms of evolution are: Environmental changes Cultural/mating preferences Population Immigration Genetic Mutation Am I missing anything? I've heard that ...
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0answers
42 views

Is there an evolutionary advantage associated with migraine? [duplicate]

I have read Wikipedia article on Genetics of migraine headaches and I don't buy it Because genetics influence susceptibility to migraine, it can be shaped by evolution. Fitness-impairing ...
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1answer
49 views

Why does the wavelength in curly hair differ?

Different people and animals have different wavelengths in the curls in their hair. I understand what purposes hair serves in protecting the skin from light and bugs. I am wondering about the eventual ...
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1answer
33 views

Is there more diversity in marine species?

I was reading about how life emerged from oceans, and the following question occured to me. Do land species suffer from the founder effect and is there more (genetic) diversity in marine species? A ...
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3answers
2k views

Why are turtles classified as reptiles and not amphibians?

I understand that turtles are reptiles because like all reptiles, they have scales on their body. But turtles (specifically sea turtles) live on both land and water, very much like amphibians. Also, ...
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32 views

Why don't animals need filtered water? [duplicate]

Almost 10 years back when I was a kid, we had a picture in our school text of wild buffaloes drinking water from a river - which was visibly muddy. I asked my mother of why we need to drink filtered ...
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2answers
119 views

Hamilton's Rule in practice

I came across this question in USABO 2013 open exam: A mother antelope and its child are galloping along the plains, when they encounter a group of hungry lions. If the two antelopes try to escape ...
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1answer
94 views

Why do fruits have to ripen?

It seems like most fruits that we consume undergo some sort of ripening process either before or after they are picked from the vine, tree, etc. I understand that sugars are released during the ...
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2answers
62 views

Are heterozygotes always fitter than homozygotes? Can inbreeding be beneficial?

Inbreeding is mostly not very good because when there is a 'disease' in one allele, the other could/would take over the function. But when you have two of the same genes/alleles, do they, or could ...
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2answers
76 views

Relationship between lifespan and reproductive age?

I remember reading a while ago that there is a "general rule" in biology between an animals lifespan and when they reach reproductive age. In other words, an organism that reaches sexual maturity ...
4
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2answers
86 views

What's the correct name for the war of sexes in evolution?

I'm searching for the correct term for the part of the selfish gene evolution regarding sexes. In nature, this means the evolution of the traits such as the ducks' adaptation to "trap" the drakes' ...
5
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2answers
196 views

Empirical evidence for Group Selection?

A controversial concept in Biology "Group Selection", has caused confusion and conflict amongst scientists since the since the mid 1990s. The more general realm of study is termed the "unit of ...
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1answer
102 views

Why does the Vas Deferens detour over the pubic bone?

I was surprised to learn that the vas deferens detours over the pubic bone instead of taking the obviously more direct path. https://human.biodigital.com/widget?be=u1P&uaid=1ly5V Because I would ...
4
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2answers
630 views

Why is the strength of genetic drift inversely proportional to the population size?

I saw a concept on the Internet that says "the strength of genetic drift is inversely proportional to the population size". I don't know why they are inversely proportional? Can somebody explain? ...